panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834be2d0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f880d,ffffffff8350ae96,3bb,ffffffff83533c38) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000fffe18a8,ffffffff834adab5) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff8000fffe18a0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a2214d8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3cde50) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffc006c218298,1,fffffc00097fd410,ffff80002a2214d8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffc006c436188,ffff80002a2214d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc006c436188,ffff80002a2214d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffc006c436188,ffff80002a2214d8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffc006c436188,ffff80002a2214d8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff80002a2214d8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff80002a2214d8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2214d8,ffff80003c3ce1c0,ffff80003c3ce110) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c3ce1b0, count: 0 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834be2d0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f880d,ffffffff8350ae96,3bb,ffffffff83533c38) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000fffe18a8,ffffffff834adab5) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff8000fffe18a0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a2214d8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3cde50) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffc006c218298,1,fffffc00097fd410,ffff80002a2214d8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffc006c436188,ffff80002a2214d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc006c436188,ffff80002a2214d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffc006c436188,ffff80002a2214d8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffc006c436188,ffff80002a2214d8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff80002a2214d8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff80002a2214d8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2214d8,ffff80003c3ce1c0,ffff80003c3ce110) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3ce1c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3ce1c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d558bb94100, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3cdc20 rbx 0xffffffff83998e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff80002a2214d8 rax 0xffffffff83997ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc63aa2c5e8467f20 r11 0xef95ba64bfe3f06e r12 0xffffffff83998c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff81ce2065 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3cdc10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=69748 pid=82137 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a2214d8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a220fa8,0xffff80002a2202c0 process=0xffff8000fffef9d8 user=0xffff80003c3c9000, vmspace=0xfffffc006c6dd018 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77941 365123 55476 0 2 0 syz-executor 77941 432600 55476 0 3 0x4000080 fsleep syz-executor 86487 373671 58102 60929 2 0x10 syz-executor 86487 277108 58102 60929 3 0x4000090 fsleep syz-executor 47292 442885 86383 0 2 0 syz-executor 47292 399832 86383 0 3 0x4000080 fsleep syz-executor 47292 475113 86383 0 3 0x4000080 fsleep syz-executor 90296 257738 2443 0 2 0xc80 syz-executor 90296 150276 2443 0 3 0x4000080 kqsel syz-executor 90296 43577 2443 0 3 0x4000000 smrbar syz-executor 90296 471913 2443 0 3 0x4000080 fsleep syz-executor 83010 465234 3177 0 2 0 syz-executor 83010 319958 3177 0 3 0x4000080 fsleep syz-executor 83010 215926 3177 0 3 0x4000080 fsleep syz-executor 53369 460406 67786 0 2 0xc82 syz-executor 58102 190046 67786 0 2 0xc82 syz-executor 86383 153153 67786 0 2 0xc82 syz-executor 64981 517004 67786 0 2 0xc82 syz-executor 2443 433526 67786 0 2 0xc82 syz-executor 25678 185332 67786 0 2 0x2 syz-executor 55476 238132 67786 0 2 0xc82 syz-executor 3177 2100 67786 0 2 0xc82 syz-executor 67786 215645 58645 0 3 0x82 kqread syz-executor 58645 79596 15724 0 3 0x10008a sigsusp ksh 15724 508225 91724 0 3 0x98 kqread sshd-session 91724 66484 93527 0 3 0x92 kqread sshd-session 13335 293921 1 0 3 0x100083 ttyin getty 93527 195362 1 0 3 0x88 kqread sshd 30581 338215 13107 74 3 0x1100092 bpf pflogd 13107 342672 1 0 3 0x80 sbwait pflogd 80552 302597 30838 73 3 0x1100090 kqread syslogd 30838 147579 1 0 3 0x100082 sbwait syslogd 87646 55722 1 0 3 0x100080 kqread resolvd 77178 229398 80366 77 3 0x100092 kqread dhcpleased 49783 316421 80366 77 3 0x100092 kqread dhcpleased 80366 383237 1 0 3 0x80 kqread dhcpleased 19518 159648 0 0 3 0x14200 pause smr 94272 189103 0 0 2 0x14200 zerothread 43880 228519 0 0 3 0x14200 aiodoned aiodoned 55998 78823 0 0 3 0x14200 syncer update 95093 283665 0 0 3 0x14200 cleaner cleaner 79183 255280 0 0 3 0x14200 reaper reaper 26180 49827 0 0 3 0x14200 pgdaemon pagedaemon 8025 69877 0 0 3 0x14200 bored viomb 88468 493862 0 0 3 0x40014200 acpi0 acpi0 5628 118566 0 0 3 0x40014200 idle1 63036 257621 0 0 3 0x14200 bored softnet1 72197 35054 0 0 3 0x14200 bored softnet0 34230 133164 0 0 3 0x14200 smrbar systqmp 36404 15886 0 0 3 0x14200 bored systq 19130 113105 0 0 2 0x14200 softclockmp 3953 452314 0 0 3 0x40014200 tmoslp softclock 63440 90467 0 0 3 0x40014200 idle0 1 449732 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 25678 (syz-executor) thread 0xffff80002a222a70 (185332) exclusive rrwlock inode r = 0 (0xfffffc006c422a08) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3062 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffc006d596e90) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3047 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 34230 (systqmp) thread 0xffff8000ffffecf8 (133164) shared rwlock systqmp r = 0 (0xffffffff839396d8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11068 12215K 12233K 166960K 12181 0 pcb 17 12K 12K 166960K 30 0 rtable 250 8K 8K 166960K 388 0 pf 39 18K 25K 166960K 74 0 ifaddr 47 8K 8K 166960K 55 0 ifgroup 64 2K 3K 166960K 74 0 sysctl 2 1K 9K 166960K 6 0 counters 78 37K 38K 166960K 86 0 ioctlops 0 0K 4K 166960K 1488 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1294 81K 82K 166960K 1372 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 93K 166960K 164 0 proc 70 115K 164K 166960K 552 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 in_multi 104 7K 7K 166960K 106 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 395 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 229 161K 175K 166960K 3494 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 41 82K 102K 166960K 1360 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 3 0 NDP 16 0K 1K 166960K 32 0 temp 35 9114K 9120K 166960K 4079 0 kqueue 14 22K 24K 166960K 30 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 40 0 36 1 0 1 1 0 8 0 rtentry 176 115 0 3 6 0 6 6 0 8 0 unpcb 144 49 0 32 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 10 0 6 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 89 0 79 2 0 2 2 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 pkpcb 40 1 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 4 0 2 1 0 1 1 0 8 0 pppxif 1576 4 0 2 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pfstitem 24 18 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 0 1 0 1 1 0 8 0 pfstate 448 18 0 0 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 464 0 6 29 0 29 29 0 8 0 art_table 40 466 0 6 5 0 5 5 0 8 0 art_node 32 115 0 11 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1614 0 143 93 0 93 93 0 8 0 ffsino 296 1614 0 143 114 0 114 114 0 8 0 nchpl 144 1848 0 145 64 0 64 64 0 8 0 vnodes 216 1708 0 0 95 0 95 95 0 8 0 namei 1024 5687 0 5686 1 0 1 1 0 8 0 percpumem 16 58 0 4 1 0 1 1 0 8 0 kstatmem 264 35 0 4 3 0 3 3 0 8 0 scxspl 216 6255 0 6255 4 3 1 3 1 8 1 plimitpl 152 30 0 13 1 0 1 1 0 8 0 sigapl 424 493 0 446 7 0 7 7 0 8 1 knotepl 120 275 0 0 9 0 9 9 0 8 0 kqueuepl 224 33 0 20 1 0 1 1 0 8 0 pipepl 344 130 0 103 3 0 3 3 0 8 0 fdescpl 528 477 0 447 3 0 3 3 0 8 0 filepl 160 1722 0 1501 10 0 10 10 0 8 0 lockfpl 104 12 0 10 1 0 1 1 0 8 0 lockfspl 48 7 0 5 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 93 0 78 1 0 1 1 0 8 0 zombiepl 144 448 0 446 1 0 1 1 0 8 0 processpl 1232 493 0 446 5 0 5 5 0 8 1 procpl 664 547 0 491 5 0 5 5 0 8 0 sockpl 752 185 0 153 4 0 4 4 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 12 0 0 2 0 2 2 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 131 0 0 9 0 9 9 0 8 0 bufpl 272 2332 0 105 149 0 149 149 0 8 0 anonpl 32 3504 0 0 29 0 29 29 0 246 0 amapchunkpl 152 9446 0 8798 34 0 34 34 0 158 5 amappl16 200 1115 0 1097 4 1 3 4 0 8 1 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 438 0 437 1 0 1 1 0 8 0 amappl13 176 129 0 117 1 0 1 1 0 8 0 amappl12 168 734 0 705 2 0 2 2 0 8 0 amappl11 160 2 0 1 1 0 1 1 0 8 0 amappl10 152 66 0 52 1 0 1 1 0 8 0 amappl9 144 291 0 290 1 0 1 1 0 8 0 amappl8 136 101 0 99 1 0 1 1 0 8 0 amappl7 128 188 0 175 1 0 1 1 0 8 0 amappl6 120 157 0 155 1 0 1 1 0 8 0 amappl5 112 109 0 99 1 0 1 1 0 8 0 amappl4 104 294 0 276 1 0 1 1 0 8 0 amappl3 96 1690 0 1585 3 0 3 3 0 8 0 amappl2 88 568 0 507 2 0 2 2 0 8 0 amappl1 80 10623 0 10022 14 0 14 14 0 8 0 amappl 88 2727 0 2569 4 0 4 4 0 92 0 uvmvnodes 80 105 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 477 0 447 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 477 0 447 1 0 1 1 0 8 0 vmmpekpl 168 5977 0 5945 2 0 2 2 0 8 0 vmmpepl 168 39431 0 37587 86 0 86 86 0 357 1 vmsppl 488 476 0 446 5 0 5 5 0 8 1 rwobjpl 80 14287 0 13275 23 0 23 23 0 8 1 pdppl 4096 961 0 892 101 26 75 85 0 8 6 pvpl 32 10116 0 0 82 0 82 82 0 265 0 pmappl 256 476 0 446 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 421 0 29 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834be2d0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f880d,ffffffff8350ae96,3bb,ffffffff83533c38) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000fffe18a8,ffffffff834adab5) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff8000fffe18a0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a2214d8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c3cde50) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffc006c218298,1,fffffc00097fd410,ffff80002a2214d8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffc006c436188,ffff80002a2214d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc006c436188,ffff80002a2214d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffc006c436188,ffff80002a2214d8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffc006c436188,ffff80002a2214d8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff80002a2214d8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff80002a2214d8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2214d8,ffff80003c3ce1c0,ffff80003c3ce110) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3ce1c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3ce1c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d558bb94100, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83ab0d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ab0d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 exit1(ffff8000fffe82b8,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe82b8,ffff80003c3da1a0,ffff80003c3da0f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3da1a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3da1a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7eb3f4e77500, count: 7 ddb{1}> trace x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83ab0d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ab0d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 exit1(ffff8000fffe82b8,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe82b8,ffff80003c3da1a0,ffff80003c3da0f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3da1a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3da1a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7eb3f4e77500, count: -8